Ignition system



W. A. CHRYST.

IGNITION SYSTEM,

APPLICATION FILED SEPT-7,1917.

1,391,460. I PatentedSept. 20, 1921.

witnesses //I {D WWW UNITED STATES PATE T, OFFICE.

WILLIAM A. CHRYST, OF DAYTON, OHIO, ASSIGNOR TO THE DAYTON ENGINEERING LABORATORIES COMPANY, A CORPORATION OF OHIO.

IGNITION SYSTEM.

Specification of Letters Patent. Patented Sept, 20 1921 Application filed fieptember 7, 1917. Serial No. 190,150.

To all whom it may concern:

Be it known that I, WILLIAM A. Gnnrs'r, a citizen of the United States of America, residing at Dayton, county of Montgomery, and State of Ohio, have invented certain new and useful Improvements in Ignition Systems, of which the following is a full, clear, and exact description. v

This invention relates to an improvement in ignition systems, and more particularly to that part of ignition systems which includes the timing anddistributing mechanism. Oine of the objects of the present invention is to provide means for the adjustment and mounting of certain parts of the timing mechanism ofthe ignition system, whereby the adjusted position of said parts may be readily secured and maintained with pre- Figs. 5, 6 and 7 are detail views of certain parts ofsaidlocking device.

' Referring to Fig. 1, there is disclosed what may be termed a timing and dlstrlbutlng mechanism, which is adapted to control the time of occurrence and the distribution of the sparking impulses to an engine.

This timing and distributing device is preferably driven by an engine, at any predetermined ratio 0 s eed, through a connection with the sha" 20. Thls shaft 20 projects into the casing 21 and is secured to a plate or disk 22, which in turn carries the pins 323. These pins 23 formp1vot points for the weights 24:, which are mounted thereon in any suitable manner. Eachof the weights 24 engage with a spider, carried by the stub shaft or carrymg element26; this arm or element in the present mstance being hidden from view by the assembly, of the weights.

1 is a view in side elevation "of a tering and William A. Chryst, No. 1,303,831

dated May 13, 1919, and no further descrip tion of these elements is deemed necessary in the present application, except where description is necessary to clearly bring out the features of the present invention.

The cam carrying element 26, as has been stated heretofore, fits over the stub shaft 27, and is provided with a reduced head portion 28, which is tubular in conformation and suitably slotted as at 29, so as to provide a plurality of expansible and slightly resilient fingers 30.

This reduced head portion of the cam carrying element 26 supports the cam elelobes 32 to actuate the movable contact element 33 (see Fig. 2), to break the ignition '36 which tends to normally maintain the contact plate 33 in circuit closing position relative to the contact 35.

Now as soon as the cam rotates, the lobes force it away against the tension of the spring 36. As soon as the cam will have passed out of contact with the contact plate 33, a spring 36 will immediately return said contact plate to circuit closing position.

The cam 31 is provided with a reduced head portion or shank 3-7, which is provided with a fiat on each side as at 41, to prevent relative movement of the distributor rotor 38, which is mounted dire'ctl thereon.

'It is well known to those skilled in the art, that the adjustment of the timer, cam relative to the movable contact 33, must be made with precision, and that it frequently becomes necessar' to change this adjustment to compensate or wear, varying engine conditions, and certain other well known conditions. i

The adjustment of the timer cam also makes 90 carried thereby will strike the same and rotor of the distributer, so that the timer cam and the rotor will operate in a determined relation, and it is important that thls relation be maintained.

In order to secure and maintain the proper adjustment of the cam and the rotor, there is provided in the present form of the 1x1- vention, a bolt 45 threaded at one end as at 46, to engage with the threaded opening 47 formed in the cam carrying element 26. This bolt or screw 45 is grooved intermediate its ends as at 48, to provide a seat for the ring 49. This bolt 45, as. stated above, is I 15 threaded at its lower end and forms the controlling element of the locking devlce.

Between the grooved portion 48 and the head of the bolt 45, a sleeve 50 is positioned, which is preferably provided with an externally tapered surface. The distance between the groove 48 and the head of the bolt 45, is greater than the length of the sleeve 50, so that the bolt45 may be moved relative to the sleeve, for the purpose described hereinafter.

By referring to Figs. 3 and 4 it will be noted that when the cam 31 has been placed on the expansible shank of the cam carrying element 26, and adjusted to its proper position relative to the contact plate 33. the bolt' 45, carrying the tapered sleeve 50 and the ring 49, is forced down through the shank portion of the cam carrying element 26, and the threaded end of said bolt is screwed home as is shown in Fig. 3.

W hen the bolt 45 is screwed into the cam carrying element 26, the tapered sleeve 50 tends to engage the fingers or prongs of the expansible shank, and to force the same outwardly into frictional contact with the cam 31.

Inasmuch as the bolt '45 turns relative to the sleeve 50, there is no tendency for an imperfect contact between the fingers of the shank and thus an even distribution of pressure is exerted against eachof the prongs of said shank.

It will further be seen, by referring to the Figs. 3 and 4, that the initial movement of the sleeve 50 is in a direct downward direction, that is the sleeve has no turning effect,

and therefore efficient and permanent expansion of the prongs is effected by the foremg of this sleeve downwardlyinto the in-.

terior of the shank.

When it is desired to release the cam for the purpose of readjustment,,or for com-' plete removal, the bolt 45 is unscrewed and when said bolt works upwardly, as shown in Fig. 4, the ring 49, carried in the groove 48, engages the lower end of the tapered sleeve 50 and will force the same out of its looking position, so as to readily permit the readjustment of the cam 01 the complete removal thereof from the cam car y ng e ement 26.

menace In order to positively retain the ring 49 unscrewed to adjust the cam carrying element, the lower, inner portion of the tapered ring 50 is beveled 01f as at 51, which beveled portion will tend to press the ring 49 and thereby prevent the same from being forced out of the groove 48.

From the above description it will be seen that the ring 49 tends to positively force the said locking sleeve 50 upwardly for the. releasing movement, while the head of the bolt 45 tends to positively drive said sleeve into its locking position. a

By referring to Fig. 1, thearrangement of the rotor on the cam 81 is clearly shown, and it will be apparent that if the cam is adjusted to any determined position, a consequent adjustment of the rotor must be made, inasmuch as this rotor fits over a portion of, the cam 31 and is held against a relative movement by 2 flat sides, formed in the opening of the rotor.

.While the form of mechanism herein shown and described constitutes a preferred form of embodiment of the invention, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What I claim is as follows:'

1. In a device of the character described, the combination with a rotatable cam carrying element having an expansible shank; of a cam supported on said shank; a member for expanding said shank; and meansfor forcing said expanding member into said shank, said means being capable of move grent independently of said expanding mem- 2. In a device of the character described, the combination with a rotatable cam carrying element having an expansible shank; of a cam supported on said shank; a member for expanding said shank; and means for forcing said expanding member into said shank, said means being capable of move-' ment independently of said expanding member, and said means having provisions for effecting removal of said expanding memberi of said sleeve.

, 4. In a device of the character described, the combination with a driving shaft; of an ignition device, including a cam carrying element having an expan ible shank; a cam adapted .to fit on said shank; a locking sleeve; a bolt carrying said sleeve and adapt ed to forcethe same into the shank of the cam carrying element to expand it and lock the cam inadjusted position, said bolt. having vprovisions to force the sleeve out of its locklng position to release'the cam.

5. In a device of the character described, the combination with a driving shaft, of an ignition device including a cam carrying element having an expansible shank; of a cam adapted to fit on said shank; a tapered locking sleeve; abolt carrying said sleeve and provided with a head adapted to engage the sleeve and to force the same into engagement with the shank of the cam carrying element and expand said shank and thereby lock the cam in adjusted position, said bolt having also a groove disposed at a distance from the head to enable the sleeve to be disposed between the groove and the head; and a ring locatedin said groove and adapted to engage the sleeve, when the bolt is unscrewed from the cam carrying element.

6. In a device of the characterdescribed, the combination with a driving shaft, of an ignition device including a cam carrying element having an expansible shank; of a cam adapted to fit on said shank; a tapered locking sleeve having an internally tapered portion; a bolt having screw threaded engagement with the cam carrying element and having a head adapted to engage the sleeve and to force the same into the shank of the cam carrying element and to expand said shank thereby -to lock the cam in ad- ,Mjusted position, said bolt having a groove located at a distance from the head such that the sleeve may be disposed on the bolt between the groove and the head; and a split ring located in the groove and adapted to engage the sleeve when the bolt is unscrewed from the cam carrying element whereby to effect the removal of the sleeve from the shank portion, said internally tapered portion of the sleeve engaging the ring whereby the ring will be maintained in position in the groove as the ring effects the removal of the sleeve from the shank.

7. In a device oi the character described, the combination with a driving shaft; of an ignition device including a cam carrying element having an outwardly expansible portion; a cam adapted to fit over said expansible portion; movable expanding means for expanding said expansible portion; and screw-threaded means engaging the cam carrying element for moving the expanding means 1nto en agement or out of engagement with said expansible portion, said screw-threaded means being rotatable independently of said expanding means.

8. In a device of the character described, the combination with a driving shaft; of an ignition device including a cam carrying ele ment having a plurality of outwardly eX- pansible portions; a cam adapted to fit over said expansible portions; an axially movable expanding sleeve for expanding said expansible portions; and screw-threaded means passing through said sleeve and engaging the cam carrying element and having provisions for moving the expanding ineans into engagement or out of engagement with said expansible portions, said screw-threaded means being rotatable independently oi" said expanding means.

In testimony whereof I aflix my si nature.

- WILLIAM A. CHR ST. Witnessed b J. W. MbDoNALD, WALTER M. Human. 

